Check the Project Cost Collection Enabled parameter in the Organization Parameters window in Oracle Inventory.
Note: This check box can be enabled if only Oracle Projects is installed. It has no relation to the Project Reference Enabled check box, and it does not depend on installation of Project Management.
Associate Expenditure Types with Cost Subelements. See: Associating Expenditure Types with Cost Elements.
Associate expenditure types with cost subelements. See: Defining Material Subelements and Defining Overhead and Resources window in BOM.
Define project cost groups and associate WIP accounting classes with each project cost group. Repeat for all new projects See: Defining Project Cost Groups.